Added Elevation to Category

-Getting Elevation from Google's API in multiple chuncks since google
 only allows 512 locations to be queried at a time.
-Storage of Elevation in server done throught local file, in future
 hopefully one Amazon's S3
-Javascript on browser to display map with course polyline
-Using coffescript to generate the javascript for map display
-TODO: fix course display as sometimes it seems to display other
 categories courses.